【作者】 彭伟功；

【导师】 向晓东；

【作者基本信息】 武汉科技大学 ， 安全工程， 2004， 硕士

【摘要】 高梯度磁净化技术(High Gradient Magnetic Separation．HGMS)是一种高效快速而新颖的净化技术。本文研究了高梯度磁净化除尘的一些工艺条件及其对高梯度磁净化除尘效果的影响。主要内容包括： 首先通过单因素多水平实验及正交实验确定了影响除尘效率的主要因素及其影响规律。实验得出最佳工艺条件为：磁场强度5.2KGs，钢毛填充率为5％，过滤速度为0.5m／s，过滤周期为300s。其中钢毛填充率对除尘效率的影响最大，其次为过滤风速，再次为磁场强度，最后是净化周期。 在最佳工艺条件下，对磁种、武汉钢铁公司烧结厂采样粉尘以及青山造船厂粉尘三种强磁性粉尘的除尘效率可达90％以上，但对武钢乌龙泉矿石灰石破碎粉尘和洛阳水泥厂粉尘两种弱磁性粉尘的除尘效率均低于60％。对弱磁性粉尘采用加入磁种的方法来提高其除尘效率。除尘效率随着磁种投加比例的增加而有较明显的增加。对于武钢乌龙泉矿石灰石破碎粉尘在不投加磁种条件下除尘效率仅有59.1％，当投加比例为2％时，除尘效率增加到61％，而投加比例为10％时，除尘效率高达77.6％。 本文建立了轴向饱和堆集模型，推导出粉尘的分级除尘效率计算式，讨论了影响高梯度磁净化除尘效率的外在操作参数。 本文利用流体力学、磁学等理论，详细讨论了高梯度磁净化除尘的机理。通过聚磁介质与粉尘颗粒以及粉尘颗粒之间的作用分析，揭示出影响除尘效率的内在因素。更多还原

【Abstract】 High Gradient Magnetic Separation (HGMS) is a new, efficient and speedy separation technology The technology characteristics and the influence of operative conditions on the dust removal efficiency of HGMS were systematically studied in this paper. The main aspects are as follows:The single condition experiments and the orthogonal experiments were conducted in order to get the main factors which effect on the rate of dust removal and to get the influence law. The result of the experiments shows that the best technological conditions are: the magnetic field intensity is 5.2KGs,the rate of steel wire filling is 5%, separation velocity is 0.5m/s, separation cycle is 300 .The result also shows that the rate of steel wire filling is greatest influence on the removal rate, the second is separation velocity, the third is magnetic field intensity, the last is separation cycle.It is shown by experiments that the rate of dust removal can exceed 90%, when the best technological condition were applied to strong magnetic dust, but for weak magnetic dust, the rate is lower than 60%. As to get a high dust removal rate of weak-magnetic dust, magnetic seeds are added into. The higher the ration of magnetic seed to dust, the higher the rate is. Take the limestone dust from Wuhan Iron and Steel work for example, the dust removal rate is only 59.1% without magnetic seed, but a rate of 61% can be get when the ration of magnetic seed to dust reaches 2%, a rate of 77.6% when the ration reaches 10%.According to some research results conducted by former researchers, the axial build-up model was established for the particle in HGMS process, and the removal rate of dust particle was conducted. And the operating parameters, which affect the removal rate, are studied.The mechanism of dust removal with HGMS is studied through hydrodynamics and magnetism in this paper. The inside factions, which have influenced the removal rate, are disclosed through analyzing the interaction between the medium and dust, and the interaction among dust.更多还原